Suction air intake



April 1928. 1,664,683

0.. G. HAWLEY SUCTION AIR INTAKE Filed May 1925 Patented Apr. 3, 1928.

UNITED STATES 1,664,683 PATENT .OFFICE.

CHARLES GILBERT HAWLEY, OF CHICAGO, ILLINOIS, ASSIGNOR T0 CENTRIFI'X COR- PORATION, 0F CLEVELAND, OHIO, A CORPORATION OF OHIO.

sucrron AIR INTAKE.

Application filed May 4,

This invention relates to suction air intakes and has for its object the purification of air (and gases) going to compressors and blowers or intended to directly supply rooms in which the air must be kept pure.

The invention will be readily understood on reference to the drawings that form part of this specification, and in which I Fig. 1 is a vertical section of a suction air intake embodying my invention.

Fig. 2 is a horizontal section on line 22 of Fig. 1.

Fig. 3 is a horizontal section on line 3--3 of Fig. 1; and

Fig. 4 illustrates a modification in the upper part of the device. 1

All parts of this device through which the air passes are stationary. This is said to avoid confusion with various rotating devices that have been submitted for the purpose. Generally these devices are used in an upright position, resting upon the top of the air intake pipe or duct 2. As a matter of fact it can be used in an inverted position and even upon a horizontal axis. The position shown is therefore only exemplary.

The base of the device may rest upon a flange of'the pipe 2 or may be threaded for attachment thereto as indicated in Fig. 1. Said base comprises a bowl 5, of larger diameter than the pipe 2. It is characterized not only by large diameter but by a tangential peripheral outlet or nozzle 6, the latter preferably terminating in an elbow 7. Depending from the latter is a dust and moisture pocket 8. At tightly closed by a removable cap or valve 9. The part 10 represents a cut-off valve which is interposed between the pocket 8 and the bowl 5. The purpose of the valve will be described hereinafter.

Resting on the upper edge of the bowl is a wide ring 11, containing a central hole 12 that is coaxial with the pipe 2 but considerably larger in diameter. The ring may be secured to the bowl in any suitable manner as by means of the lugs 13 and bolts 1 1.

Upon the ring 11 I erect the circumferential series of operatively overlapping tangential tuyere blades 15 of such length and number as to provide the numerous slit-like tangential tuyeres 16. The aggregate area ofv these tuyeres 16 approximates the areaof the pipe 2, and by preference exceeds that area by so much as is required to offset the fricthe lower end, the pocket 8 is- 1925. Serial N0. 27,842.

ticn the air that is rapidly drawn through the tuyeres. The inner edges of the tuyere blades rise substantially from the margin of the hole 12 in the ring 11 so that it may be said that like the ring the tangential tuyere ring has a diameter that exceeds that of the pipe 2.

The upper end of the tuyere ring is formed by fastening together the upper ends of the tuyere blades as by means of atop ring 17.

The upper end of the tuyere ring is closed by a top plate 18. This may partake of the form, shown in Fig. 1, or of the form shown at 18 in Fig. 4.

The centrifugal effect of the inwardly directed tangential streams or films of indrawn air is to set the whole content of the tuyere ring and bowl 5 into very rapidv rotation, and in consequence the heavier substances (dust, lint, and the like) are instantly separated and deposited against the inner surfaces of the tuyere blades. Whirling downward thereon the dust particles reach the base of the tuyere ring (the ring 11) and are forcibly thrown outward to the margin of the bowl 5; that is, all such particles whether dust or collected moisture, are thus forcibly removed from the region of the central outlet 2 in the bottom of the bowl. The heavier substances continue to whirl in the bowl untilthey are discharged through the nozzle 6, thence to fall into the pocket 8. That pocket being closed at the bottom no air can either enter or escape therefrom and the heavier substances continue to collect therein.

The lower end of the pocket may be opened to discharge the dust at any time that the compressor or blower is shut down. At other times the valve 10 must be closed before the cap 9 is removed, otherwise the collected dust would be drawn up in the pocket and return to the bowl, with a possibility of its escaping therefrom and into the suction pipe 2.

The top 18 shown in Fig. 4 is fixed. Its chief characteristics are the annular surface 19 and the relatively depressed central pore tion 20, leaving the dust interfering shoulder adjacent the blades of the tuyere ring. There is a natural tendency for the air admitted at the tops of the tangential tuyere to flow toward the axis of the tuyere ring and this shoulder 21 serves toprevent the carriage of the "better to adjust the operation of the intake device to the operation of the compressor or blower at the lower end o fithe pipe 2.

"VVhen the'device is used outdoors it is providedwith a rainhood or shield 24. WVhen used indoors a simple cylindrical screen 25 suffices. v

As various modifieations'of this invention will readily suggestthems'elves to those who are skilled in the art, it shouldbe understood that'the invention is not limited to the precise structures 'hereinbefore illustrated. Instead I'broadly claim the following:

1. The hereindescribed suction-intake-comprising a bowl having a large central outlet in its bottom and having a small peripheral outlet in combination with a closed pocket depending from said peripheral outlet, and a multiple tangential tuyere of less diameter than said bowl but of greater diameter than said central outlet, and -resting upon 5 said bowl.

2. The hereindescribed suction intake comprising a bowl havinga central outlet in its bottom and provided with a peripheral discharge nozzle, in combination with a dust pocket depending from-said nozzle,a-removable closure at the lower end ofs'aid pocket, a eutoii valve interposed between said pocket and said nozzle and means for whirlingly directing air into'said'bowl. 1

In testimony whereof I have hereunto set my hand this 30th day of April A. B 1925.

CHARLES GILBERT HAWLEY. 

